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Old 05-23-2002, 08:09 PM   #1
jeff22
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Default RS-T turbo cooling?

where do the RS-T guys tap into the cooling system for turbo cooling? what hose/hoses do you use?
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Old 05-23-2002, 10:03 PM   #2
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you can do what I'm doing.

I bougth a seperate electric water pump and somewhat small cooling core. I'm going to keep the whole thing seperate in hopes that it will lower the turbo temps which would in theory if I can keep it cool enough lower my intake charge temps

Brad
is running out of money for toys
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Old 05-23-2002, 10:20 PM   #3
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There was a post on this a while back, they said to tee it off the heater core line.
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Old 05-23-2002, 10:28 PM   #4
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You can use your heater core lines by the fire wall.
Alan
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Old 05-23-2002, 10:32 PM   #5
Graham
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Yes, Alan is right, tap the heator core lines running into and out of the fire-wall. Tap one (doesn't matter which) for the feed, and one for the return and your golden.

Oh yeah, aigburth is the only person known in the U.S. with a Legacy B4 TT engine succesfully swapped into a right hand drive Impreza. Just a tid bi of info. that some people might want to know about.


Graham
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Old 05-25-2002, 11:14 AM   #6
Boostup!
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Jeff22, I just did this mod a week ago. After wondering about whether or not the heater core had a shut off valve to it and nobody here seems to have a definite answer. I decided to get the coolant supply from the passenger side cylinder head, on the back side. The return is to the heater core return line, it will go straight into the water pump.

As for the hoses, I am using all -8 AN fittings and similar sized SS braided lines. These hoses are quite big and should supply plenty much coolant to the turbo.
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Old 05-25-2002, 08:39 PM   #7
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The heater core does have a shut off so you have to tap off before the shut off for your supply.
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Old 05-25-2002, 08:44 PM   #8
zaidallas
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Boostup! : where exactly is the pass. side head coolant port that you used for feed , and also how do you know which heater hose is the return line ?
zaidoun
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Old 05-26-2002, 12:04 AM   #9
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Zaidoun, go to this link http://www.imprezars.com/images/turb...rboinstall.pdf
On page 16, steps 55 and 56 will show you how to locate the 12mm allen plug. BTW, the install manual is for JCS turbo kit.

As for identifying which is the heater return line, look for arrows on the heater hose itself, where it enters and exits the firewall. Also, if you look on the engine side, one of the hose will be connected to an aluminum piece on top of the block (supply) and another one will be connected to a black steel pipe (return).
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Old 05-26-2002, 01:45 AM   #10
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here's an idea but I don't know if its been suggested before :

There are 4 coolant nipples around the TB , as I undestand it , it flows like this : 1) block (drivers side of TB)-----> 2 ) Idle air control in TB----> 3) out if idle air conrol ------> 4) into block under TB .
New setup allows you to do the TB coolant bypass mod AND get coolant to your turbo :
1) block (driver side of TB)-----> 2) turbo in -----> 3) turbo out --------> 4) into block under TB . you'll be left with the TB not getting any coolant and the block feeding the turbo coolant and dumping it back into the block and simply plug up the 2 nipples on the TB .
Like I said this might've been discussed before but don't know if it will work . It seems like the logical thing to do.
I've had my water cooled turbo for about a year but I don't like the way that I originally setup the coolant lines to/from the turbo so this is what I came up with .

zaidoun
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Old 05-26-2002, 10:24 AM   #11
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NO! Don't cut off the coolant supply to your TB. When the weather is just right, the air travelling pass the throttle butterfly at part open position, is acelerated (like venturi effect), and will freeze. Very dangerous.
If you want to go this route at all, just run the turbo in series with the TB, that way both are happy.

I did thought of using the TB coolant for turbo cooling but I wanted more flow than what the TB lines can provide.
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Old 05-26-2002, 01:08 PM   #12
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BOOSTUP the theory has been proven to be true in older cars, But i've been driving around for about the last year (no winters)
with the coolant lines disconected from the TB and I haven't had any problems. I've driven down the road reading 5deg cel. reading on my IAT and haven't had any problems. That is on a normally asp. motor. I've heard of a intake Freezing up for some fellow techs in the past but that is it! I think now the coolant lines going to the TB is to reduce NOX, to get the car up to operating temp faster? (so i've heard) But also with the turbo I'dont think freezing up of the intake is a concern, considering the intake run about 100Deg hotter most of the time.. I think i will try the TB coolant lines seems like the easiest thing to do. Least amount of modifing!

Thanks Jeff
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Old 05-26-2002, 02:13 PM   #13
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Jeff, you are right, I was still in my old school of thought when I wrote that. Sorry for the mis-information.
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Old 05-27-2002, 02:39 PM   #14
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Boostup Thats cool, don't get me wrong. It's not
mis-imformation I think i'd be concerned with a N/A motor in the middle of winter with 10 deg below zero temp. As for now I'd wouldn't give it a second thought! Thanks for the info, I thought I was the only one that has heard of this.

How is you vishnu kit coming along? I still need to put an exhaust on. But it does sound good with just a 3" down pipe!
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Old 05-27-2002, 04:48 PM   #15
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My Vishnu kit is all done except for the exhaust too. I was driving it around with no cat-back.........it was loud as hell and scared the crap out of me when it back fired during start up
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Old 05-28-2002, 12:37 AM   #16
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I too have been driving around since April 2001 with the TB coolant lines disconnected. My TB fuel injector plate required me to disconnect the lines because the TB needed to move back 1" and the lines wouldn't let it.

Don't know if those lines would flow enough to cool the turbo though.

Larry
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